@serge73. Thanks for posting. Sorry for not replying sooner.
I currently can’t commit myself to making any major changes to the Easy File Uploader. I am already behind in a few of my project.
However, the change to check for maximum size of an image is best done with Javascript before uploading the file. As for renaming the file, I am sure what you have in mind, but that may be a little more involved that what you explain. That change may be unique to your particular setup and requirements.